Trenching plow with reciprocating action

Abstract

A trenching plow adapted for attachment to a vehicle, the plow having an elongated shank having a blade formed along a lower portion of a leading edge of the shank, the blade having a first soil cutting surface along the leading edge, a first cutting arm pivotably arranged at a forward lower portion of one side of the shank generally parallel to the shank and a second cutting arm arranged at a forward lower portion of an opposite side of the shank generally parallel to the shank. Further, a drive means for reciprocating upper portions of the first arm and the second arm is used.

What is claimed is:  
     
       1. A trenching plow adapted for attachment to a vehicle, said plow comprising: 
       an elongated shank having a blade formed along a lower portion of a leading edge of said shank, said blade having a first soil cutting surface along said leading edge;  
       a first cutting arm pivotably arranged at a forward lower portion of one side of said shank generally parallel to said shank;  
       a second cutting arm arranged at a forward lower portion of an opposite side of said shank generally parallel to said shank;  
       a drive means for reciprocating upper portions of said first arm and said second arm.  
     
     
       2. The trenching plow as recited in  claim 1 , wherein said first cutting arm has a short portion, extending forwards and downwards from said pivot axis, and a long portion, extending backwards and upwards from said pivot axis, and said second cutting arm has a short portion, extending forwards and downwards from said pivot axis, and a long portion, extending backwards and upwards from said pivot axis. 
     
     
       3. The trenching plow as recited in  claim 1 , wherein said first cutting arm and said second cutting arm move in a scissor movement, so that when said first arm is moving with its short portion in a forward direction, said short portion of said second arm is moving in a rearward direction. 
     
     
       4. The trenching plow as recited in  claim 2 , wherein said long portion of said first arm is connected to said drive means via a first connecting rod and said long portion of said second arm is connected to said drive means via a second connecting rod. 
     
     
       5. The trenching plow as recited in  claim 4 , wherein said first connecting rod has a first small end and a first large end, said first small end connected to said first arm and said first large end eccentrically connected to said drive means, and said second connecting rod has a second small end and a second large end, said second small end connected to said second arm and said second large end eccentrically connected to said drive means, so that said drive means imparts an eccentric movement to said first large end and said second large end, respectively, causing said first connecting rod and said second connecting rod to move reciprocically in a direction rearwards downwards from said drive means, thus causing said first arm and said second arm to pivot around said pivot axis in a scissor movement. 
     
     
       6. The trenching plow as recited in  claim 2 , wherein said first arm has a cutting edge arranged at a leading edge of said first arm, and said second arm has a cutting edge arranged at a leading edge of said second arm. 
     
     
       7. The trenching plow as recited in  claim 1 , wherein said plow further comprises means to raise and lower said plow with respect to said vehicle. 
     
     
       8. The trenching plow as recited in  claim 7 , wherein said plow further comprises a first feeding means hingedly attached to a trailing edge of said shank, for directing an elongate material to be buried in the trench down into said trench behind said plow. 
     
     
       9. The trenching plow as recited in  claim 8 , wherein said first feeding means has a top soil displacement means arranged at a top of said first feeding means, for depositing soil moved to the surface of the ground during operation of said plow at either side of said plow. 
     
     
       10. The trenching plow as recited in  claim 9 , wherein said displacement means comprises an Archimedean screw and reversible propulsion means, for rotating said screw in a chosen direction of rotation. 
     
     
       11. The trenching plow as recited in  claim 8 , wherein said plow further comprises a second feeding means hingedly attached to a trailing edge of said first feeding means, for directing a further elongate material to be buried in the trench down into said trench behind said plow.